Photo by: Francois Mori
The tennis ball of french veteran Nicolas Mahut is marked with a sign during a training session in the French Tennis Federation center near the grounds of the French Open in Paris, Wednesday, May 13, 2020 under the watchful eye of a team doctor and courtside trainers. Professional tennis players resumed training in France after the end of lockdown amid the coronavirus pandemic. (AP Photo/Francois Mori)